Are they transitioning at your daycare? With new babies that scream angrily because they don't get picked up I ask the parents to think about it at home before they automatically pick up their baby. Is he/she fed, dry, should they be learning to play on their own without direct entertainment from parents?

These attachment parents don't seem to realize that their child is their own person, not an extension of themselves. You have to choose your words carefully when talking to the parents but make it clear that you may not be able to continue care unless the parents work with you to help their child progress into group care.

I agree that CIO works.